It's the second time we've seen Kate in the £215 dress, which has a statement black waist belt, the first being for Meghan Markle and Prince Harry's rehearsal dinner for their wedding back in May 2018.

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Kate wore minimal make up for the special day and completed the look with simple gold hoop earrings.

Kate's hair was longer last time we saw her (Image: Kelvin Bruce)

It's a big change (Image: PA)

She held her daughter's hand as they walked across the school car park before being greeted by Helen Haslem, head of the lower school.

The teacher shook hands with George and Charlotte, and William told her his daughter was "very excited" to get started.

As they walked Charlotte flicked her ponytail and cast a suspicious glance at the small group of media and Palace press officers.

Kate said: "How are you?" before asking Ms Haslem: "Did you have a nice summer?"

It's a big day for Princess Charlotte (Image: PA)

Princess Charlotte, hide behind her mother the Duchess of Cambridge as she arrives for her first day at school, with her brother Prince George and her father the Duke of Cambridge at Thomas's Battersea in London. (Image: PA Wire/PA Images)